1289964 has 24 divisors (see below), whose sum is σ = 3241840. Its totient is φ = 396864.

The previous prime is 1289963. The next prime is 1289969. The reversal of 1289964 is 4699821.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (1289963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3979 + ... + 4290.

2^1289964 is an apocalyptic number.

It is an amenable number.

1289964 is an abundant number, since it is smaller than the sum of its proper divisors (1951876).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1289964 is a wasteful number, since it uses less digits than its factorization.

1289964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8289 (or 8287 counting only the distinct ones).

The product of its digits is 31104, while the sum is 39.

The square root of 1289964 is about 1135.7658209332. The cubic root of 1289964 is about 108.8577106966.

The spelling of 1289964 in words is "one million, two hundred eighty-nine thousand, nine hundred sixty-four".